/*避免公共部分重复的复制粘贴*/
body{
    margin:0 auto;
}
.myFlex_x{
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
}
.myFlex_y{
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
